Simultaneous adsorption of lead and cadmium on MnO_2-loaded resin

查看全文 作　　者：Lijing Dong,Zhiliang Zhu,Hongmei Ma,Yanling Qiu,Jianfu ZhaoState Key Laboratory of Pollution Control and Resource Reuse,Tongji University,Shanghai 200092,China

出　　处：《Journal of Environmental Sciences》索引2010年第22卷第2期,共5页

基　　金：supported by the National Mega-Project of Science and Technology of China (No.2008ZX07421-002);the International Cooperation Project of Chinese Ministry of Science and Technology(No.2007DFR90050) 摘　　要：MnO2-loaded D301 weak basic anion exchange resin has been used as adsorbent to simultaneously remove lead and cadmium ions from aqueous solution.The effects of adsorbent dosage,solution pH and the coexistent ions on the adsorption were investigated.Experimental results showed that with the adsorbent dosage more than 0.6 g/L,both Pb 2+ and Cd2+ were simultaneously removed at pH range 5-6.Except for HPO 42+ ,the high concentration coexistent ions such as Na + ,K + ,Cl+ ,NO3-,SO42+ and HCO3-,showed no significant effect on the removal efficiency of both Pb2+ and Cd2+ under the experimental conditions.The coexistence of Mg2+ ,Ca2+ caused the reduction of Cd2+ removal,but not for Pb2+ .The adsorption equilibrium for Pb2+ and Cd 2+ could be excellently described by the Langmuir isotherm model with R2 > 0.99.The maximum adsorption capacity was calculated as 80.64 mg/g for Pb2+ and 21.45 mg/g for Cd2+ .The adsorption processes followed the pseudo first-order kinetics model.MnO2-loaded D301 resin has been shown to have a potential to be used as an effective adsorbent for simultaneous removal of lead and cadmium ions from aqueous solution. 关键词：二氧化锰吸附剂镉离子除铅负载树脂弱碱性阴离子交换树脂反应动力学模型离子共存

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Simultaneous adsorption of lead and cadmium on MnO_2-loaded resin

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